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PANASONIC TX21GV1C CHASSIS Z-421V SCH.

TV - SERVICE MANUAL
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SERVICE MANUAL
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    PANASONIC TX-21GV-1C CHASSIS Z-421V SCH. TX21GV1C Z421V TX 21 GV 421 421V
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Relevant TV forum topics:
Panasonic TX-L42ETW5 Device does not start anymore, stand-by LED lights up red, no SOS error code
Manufacturer: Panasonic

Type: TX-L42ETW5

Chassi: LA35



Hello everybody,

I could determine or measure the following with the device:

Device does not start anymore, stand-by LED lights red when device is plugged in and flashes red as soon as an IR command (key press) is sent via the remote control. Voltages of power supply STB 5V and signal LCD_TV_SUB_ON come from A-board. Power supply starts, supplies P15V and SUB1.1V, 1.5V, 1.8V, 3.3V, 5V, HDMI3.3V and USB5V are generated on the A-Board (stand for about 2.5 seconds). Then signal LCD_TV_SUB_ON goes low (voltages go away to STB 5V) and after about 2 seconds back to high (endless). What is missing is the voltage PNL12V which is switched on by PANEL_VCC_ON2. PANEL_VCC_ON2 always has a low signal and does not change its state. Power supply also provides for the 2.5 seconds the 24V for the backlight. Clocking of LCD_TV_SUB_ON starts immediately after plugging in the mains plug (also without IR command). SOS error code is not output. The over-voltage circuit in IC 5000 pin 7 also does not respond. Attached is the timing diagram from the technical training of Panasonic where I have drawn until when the boot process behaves normally.

In my opinion a mistake on the A-board? Does anyone have a tip?

greetings

Andi
RGB Mod in Panasonic CTP-2780SF CRT

I posted here a while ago but no answers:
https://elektrotanya.com/comment/reply/91852#comment-form

Made some good progress, but there seems to be a sync problem.
I posted to the EEV blog for more help:
https://www.eevblog.com/forum/projects/rgb-mod-in-panasonic-ctp-2780sf/msg5615065/

 

 

Any help or feedback appreciated.

Panasonic CP830
Ez a készülék, készenléti ledje villog, és semmi más. A táp fesz 130V helyett csak 30V, és még egy helyen 10v körül van benne, az elkókat cseréltem, strf ic cserélve, optó cserélve, mi lehet? Még a szekunder oldalon a 250Vos elkók is cserélve.
Panasonic TX-29PX15P GP2N alaplap fűggőleges eltérítési hiba (megoldva)
Szevasztok! Az igazság, hogy nincs még itt a gép, csak szeretnék fejben kicsit előre dolgozni. Az ügyfél elhozta a márkaszervizből, mert egy hétig semmi infót nem adtak a javítással kapcsolatban. Persze nekem karácsonyig meg kéne javítanom. A jelenség a következő: a kép felső része fekete, középütt világító csík, alul képtartalom. A függő IC LA7876N. Na most jön a vaprosz: lehet, hogy megúszom ezzel, vagy a tápellátásának megjavításával esetleg a függö eltérítő tekercs adta meg magát? Azért lenne jó, ha kapnék erre választ, mert nem akarnám, hogy még egy ekkora monstrumot kelljen ide-oda cincálnom, kerülgetnem esetleg hiába. Csak az alaplapot hoznám el, így tervezem. Várom megtisztelő válaszaitokat. :-) Üdv!
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